CVE-2026-77806

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4.5%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.5%
EPSS %ILE
91st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Oct 7, 2026
Patch available. Sources: github_pr.
github_pr

Add SPIP X-Spip-Filtre unauthenticated RCE module

Fix merged in rapid7/metasploit-framework PR #21790 on 2026-08-24 — awaiting tagged release

https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c
github_pr

Add SPIP X-Spip-Filtre unauthenticated RCE module

Fix merged in rapid7/metasploit-framework PR #21790 on 2026-08-24 — awaiting tagged release

https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123
github_pr

Add SPIP X-Spip-Filtre unauthenticated RCE module

Fix merged in rapid7/metasploit-framework PR #21790 on 2026-08-24 — awaiting tagged release

https://github.com/rapid7/metasploit-framework/pull/21790
generic

Mise à jour critique de sécurité : sortie de SPIP 4.4.21 - SPIP Blog

https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.html

Vendor Advisories for CVE-2026-77806(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
spip4.4.10+dfsg-1 ... 4.4.9+dfsg-1 (23 versions)
  • every version up to 4.4.21+dfsg-0+deb13u1: fixed in 4.4.21+dfsg-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
spip4.4.10+dfsg-1 ... 4.4.9+dfsg-1 (16 versions)
  • every version up to 4.4.21+dfsg-1: fixed in 4.4.21+dfsg-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 43× in last 7d / 190× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 323 total refreshes for this CVE.

  1. 2026-10-07 10:15 UTCGHSA enrichment
  2. 2026-10-07 05:55 UTCGHSA enrichment
  3. 2026-10-07 01:37 UTCGHSA enrichment
  4. 2026-10-06 21:18 UTCGHSA enrichment
  5. 2026-10-06 16:50 UTCEG score recompute
  6. 2026-10-06 16:50 UTCGHSA enrichment
  7. 2026-10-06 15:18 UTCEPSS rescore
  8. 2026-10-06 12:13 UTCGHSA enrichment
  9. 2026-10-06 07:49 UTCGHSA enrichment
  10. 2026-10-06 03:06 UTCGHSA enrichment
  11. 2026-10-05 18:56 UTCEG score recompute
  12. 2026-10-05 18:56 UTCGHSA enrichment
  13. 2026-10-05 17:43 UTCEPSS rescore
  14. 2026-10-05 14:32 UTCGHSA enrichment
  15. 2026-10-05 10:07 UTCGHSA enrichment
  16. 2026-10-05 05:49 UTCGHSA enrichment
  17. 2026-10-05 01:31 UTCEG score recompute
  18. 2026-10-05 01:31 UTCGHSA enrichment
  19. 2026-10-04 23:22 UTCEPSS rescore
  20. 2026-10-04 20:49 UTCGHSA enrichment
  21. 2026-10-04 15:39 UTCGHSA enrichment
  22. 2026-10-04 11:11 UTCGHSA enrichment
  23. 2026-10-04 06:48 UTCGHSA enrichment
  24. 2026-10-04 02:31 UTCGHSA enrichment
  25. 2026-10-03 21:00 UTCGHSA enrichment
Show 75 more
  1. 2026-10-03 16:43 UTCEG score recompute
  2. 2026-10-03 16:43 UTCGHSA enrichment
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-03 05:05 UTCGHSA enrichment
  5. 2026-10-03 00:39 UTCGHSA enrichment
  6. 2026-10-02 19:56 UTCEG score recompute
  7. 2026-10-02 19:56 UTCGHSA enrichment
  8. 2026-10-02 15:37 UTCGHSA enrichment
  9. 2026-10-02 11:04 UTCGHSA enrichment
  10. 2026-10-02 06:46 UTCGHSA enrichment
  11. 2026-10-02 01:55 UTCGHSA enrichment
  12. 2026-10-01 21:25 UTCEG score recompute
  13. 2026-10-01 21:25 UTCGHSA enrichment
  14. 2026-10-01 19:50 UTCEPSS rescore
  15. 2026-10-01 14:15 UTCGHSA enrichment
  16. 2026-10-01 09:57 UTCGHSA enrichment
  17. 2026-10-01 05:40 UTCGHSA enrichment
  18. 2026-10-01 01:10 UTCGHSA enrichment
  19. 2026-09-30 20:28 UTCEG score recompute
  20. 2026-09-30 20:28 UTCGHSA enrichment
  21. 2026-09-30 12:14 UTCGHSA enrichment
  22. 2026-09-30 07:56 UTCGHSA enrichment
  23. 2026-09-29 16:15 UTCEG score recompute
  24. 2026-09-29 16:15 UTCGHSA enrichment
  25. 2026-09-29 15:24 UTCEPSS rescore
  26. 2026-09-29 06:11 UTCGHSA enrichment
  27. 2026-09-29 01:53 UTCGHSA enrichment
  28. 2026-09-28 21:36 UTCEG score recompute
  29. 2026-09-28 21:36 UTCGHSA enrichment
  30. 2026-09-28 13:52 UTCEPSS rescore
  31. 2026-09-28 13:49 UTCGHSA enrichment
  32. 2026-09-28 09:31 UTCGHSA enrichment
  33. 2026-09-28 05:13 UTCGHSA enrichment
  34. 2026-09-28 00:56 UTCGHSA enrichment
  35. 2026-09-27 20:38 UTCGHSA enrichment
  36. 2026-09-27 16:20 UTCEG score recompute
  37. 2026-09-27 16:20 UTCGHSA enrichment
  38. 2026-09-27 13:48 UTCEPSS rescore
  39. 2026-09-27 12:02 UTCGHSA enrichment
  40. 2026-09-27 06:50 UTCGHSA enrichment
  41. 2026-09-27 02:31 UTCEG score recompute
  42. 2026-09-27 02:31 UTCGHSA enrichment
  43. 2026-09-26 15:59 UTCEPSS rescore
  44. 2026-09-26 00:28 UTCEPSS rescore
  45. 2026-09-25 17:14 UTCGHSA enrichment
  46. 2026-09-25 09:10 UTCGHSA enrichment
  47. 2026-09-25 04:52 UTCGHSA enrichment
  48. 2026-09-25 00:35 UTCGHSA enrichment
  49. 2026-09-24 20:02 UTCGHSA enrichment
  50. 2026-09-24 15:43 UTCEG score recompute
  51. 2026-09-24 15:43 UTCGHSA enrichment
  52. 2026-09-24 14:04 UTCEPSS rescore
  53. 2026-09-24 11:25 UTCGHSA enrichment
  54. 2026-09-24 07:07 UTCGHSA enrichment
  55. 2026-09-24 02:50 UTCGHSA enrichment
  56. 2026-09-23 22:33 UTCGHSA enrichment
  57. 2026-09-23 18:15 UTCEG score recompute
  58. 2026-09-23 18:15 UTCGHSA enrichment
  59. 2026-09-23 17:54 UTCEPSS rescore
  60. 2026-09-23 12:55 UTCGHSA enrichment
  61. 2026-09-23 08:37 UTCGHSA enrichment
  62. 2026-09-23 04:18 UTCGHSA enrichment
  63. 2026-09-23 00:01 UTCGHSA enrichment
  64. 2026-09-22 19:43 UTCEG score recompute
  65. 2026-09-22 19:43 UTCGHSA enrichment
  66. 2026-09-22 16:01 UTCEPSS rescore
  67. 2026-09-22 13:54 UTCGHSA enrichment
  68. 2026-09-22 09:37 UTCGHSA enrichment
  69. 2026-09-22 05:18 UTCGHSA enrichment
  70. 2026-09-22 00:58 UTCEG score recompute
  71. 2026-09-22 00:58 UTCGHSA enrichment
  72. 2026-09-21 21:09 UTCEPSS rescore
  73. 2026-09-21 20:41 UTCGHSA enrichment
  74. 2026-09-21 16:23 UTCGHSA enrichment
  75. 2026-09-21 12:05 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCCuteeCat/CVE-2026-77806
    First seen Aug 24, 2026

    CVE-2026-77806漏洞检测代码

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-77806.yaml
    First seen Jan 1, 2026

    SPIP < 4.4.22 - Unauthenticated RCE

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77806?
CVE-2026-77806 is a critical vulnerability published on August 21, 2026. SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyseresultatskel.
When was CVE-2026-77806 disclosed?
CVE-2026-77806 was first published on August 21, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77806 actively exploited?
CVE-2026-77806 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.5% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77806?
CVE-2026-77806 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77806?
A fix for CVE-2026-77806 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77806 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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